Trisazo-dyestuffs



Patented Mar. 9, 1954 I UNITED STATES PATENT OFFICE.

TRISAZO -DYESTUFFS Raymond Gunst, Binningen, Switzerlaniflssign- I or to Ciba Limited, Basel, Switzerland, aSwiss firm N 0 Drawing. Application December 10, 1951, Serial No. 260,930

Claims priority, application Switzerland January 19, 1951 9 Claims. (01.260-171') This invention, provides, new trisazo-dyestuiis The coupling of the tetrazotized 4:4"-diaminowhich correspond, in the form of their free acids, diphenyl with l-amino-8-hydroxynaphthaleneto the general formula 3:6-disulfonic acid is carried out in an acid meiirwhich-Rxepresentsan aromatic radical of the dium, advantageously a mineral acid medium. benzeneserieszwhich-ispreferably sulfonated. For coupling the resulting cliazo-monoazo-com- These products can be made by coupling a pound with the diazo compound of the amine of diazo-azo-compound which, in the form of the the formula RNHz in an alkaline medium there free acid, corresponds to the general formula is advantageously used a medium rendered alka- (2 HQ 4, line with an alkali carbonate. The coupling of the diazo-disazo-compound of the Formula (2) with 1:3-diaminobenzene-4-sulfonic acid is advantageously carried out in a neutral to weakly alkaline medium.

HOIS

. 20 The dyestufis of the invention arenew and'corinwhich R has the meaning given ab v a d X respond to the above Formula (1). They are represents a diazotized amino group, with 1:3- P p y Suitable f dyeing -tanned diaminobenzene-qt-sulfonic acid; leather, especially velour leather (suede).

The diazo-azo-compounds-of the Formula (2), It is known that dyestuffs suitable for dyeing certain of which. compounds are already known, cellulose fibers of the type of Direct Deep canine-made by coupling tetrazotized 4:4'-diami- Black of the formula (Colour Inde qNo. 581, see also Schultz Farbstoiftabellen,

nodiphenyl in an acid medium on one side Wlth'i 7th edn. N0. 671) 1-amino-8-hydroxynaphthalene -'3:-6-.- disulfonic, 35 acid; a v60111911118 the resulting Compound an are not especially suitable for dyeing velour alka With at diaZO fl pound of an leather, since they have a strong tendency to proamine Of theconstitution R1NH2,in WhiCh RhalS duce: bronze effects and even with strong dyethe mea given b i'ngs, not a deep black tint but a violettish navy As mines of thefdrmulaiMNHz there come 40 blue tint is'obta'ine'd. For dyeing leather it has inta nsid ati n, f r xa p u ulf been proposed to use dyestuffs which differ aminobenzenes such as aniline and substitution from t Deep m in t t they t n Pro uc s th f u as u d h oran an additional sulfonic acid group in the benzene but pre e y aniline Sulfonic acids; s as nucleus I. Although these dyestuffs have sub am1in 2- 0r a Q' stantially less tendency to give bronze effects,

m thOXyhenZene-Aes i v f a i m n they have the disadvantageof yielding dyeings e z onw d Q' having an evenstronger. violet shade. In accord:- bGQZ DG-Z-SHEO R? d,v and; also aniline: diance with the present invention by the simple eelon ac ds; such 2 anilinermfie- 0r;-2:t5di u1ilexpedient of introducingza further sulfonic; acid ionictacidi-z ,e 1 group-into the. benzene nucleus II dyestuffs;.-are

2,671,776 3 4 obtained which, when used for dyeing velour as described in Example 1. A dyestufl of the leather, have much less tendency to yield bronze formula H NH: 80111 HO|B O|H HaN efiects than the above-mentioned dyestuffs and is obtained having excellent solubility and dyeing yield deep, bluish to greenish black tints, espem velour leather handsome greenish black tints.

cially desirable on velour leather. Similar dyestuifs of excellent solubility are The following examples illustrate the invenobtained by using, instead of 1-aminobenzene-4- tion. the parts and percentages being by weight: sulfonic acid, a equivalent q y f l-fl nfl- Exam Z6 1 benzene-3:5-disulfonic acid or l-aminobenzenep 2:5-disulfonic acid. In the latter case there is 19 parts of 4:4'-diaminodipheny1 are tetrazobtainedadyestuif of the formula Hols no NH: 50111 om Hols SOIH BIN otized in known manner. To the resulting Example3 tetrazo-solution is introduced dropwise in the The ttrazo compound from 19 parts of 4:4 21153.3?tii ioiyfiifiiffiiiiiibfi2.533555 scrie inExampe ,wi .parso 1-aminogfi if g 5. 1; igg l gfia i g fa 22 8' B-hydroxynaphthalene-B:G-disulfonic acid in a: A dilute aqueous solution of sodium carbonate is SS g sfi g ifgfi gigfiggggggg ggfi l introduced dropwise to neutralise the mineral foific acid are diazotized in known manner and acid liberated during coupling, and the mixture the diam compound is coupled in a weakly Ania iif ggg xfig f gg g gg i gg g line medium with the aforesaid intermediate ere 1 compound. After about 10 minutes a solution of at 5 C. a diazonium solution prepared from 8.8 19 parts f 1;3..diaminobenzene 4 su1gnic acid parts o aminobenzenaend a solution of 26 p t in 100 parts of water is added for the final couof $021111; cabonaterm 12o tparts water is 21mg; ffAiEitser about hang: the formailgntof Ellie poure o e coup mg mix ure w 1 e s irrmg yes u comp e e. correspon o e powerfully; the pH value should not be higher formula H 048 H O NH: B 0:11

0-CH; HO;S -S0gH HaN than 8.5. After 30 minutes a solution of 18.8 The reaction mixture is heated up to 80 C., and parts of 1:3-diaminobenzene-4-sulfonic acid is the dyestufl is precipitated in a good filtrable added. After stirring for 2 hours the reaction form by the addition of hydrochloric acid until mixture is rendered weakly acid by the addition the reaction is weakly acid to Congo. When dry of hydrochloric acid and the precipitated dyestuff it is a dark powder which dissolves in water is separated by filtration and dried. The resultwith a green-black coloration and dyes chromeing black powder dissolves easily in water and tanned leather distinctly greenish-black tints. dyes chrome tanned leather, especially velour A similar dyestufi yielding somewhat more leather, handsome bluish black tints. bluish black tints is obtained by using, instead oi.

. Example 2 1-amino-2-methoxy-5-sulfonic acid, an equivalent quantity of 1-amino-4-chlorobenzene-2-sul- The first intermediate compound is prepared fonic acid. This dyestufl corresponds to the from 4:4'-diaminodiphenyl and 1-amino-8-hyformula 8.0111 110 IITH: 801E notsmotn HzN droxynaphthalene-3:G-disulfonic acid in the 55 Example4 manner described in Example 1. Instead of the The intermediate compound from diazonium compound from 8.8 parts of aminodiaminmdiphenyl and b benzene used in that example, a diazonium comthaleneazfidisulfomc acid is prepared as pound is Prepared from parts of scribed in Example 1. The intermediate combenzene-4-sulfonic acid and coupled with the pound is coupled with the diam compound aqueous suspension of the first intermediate pared in t usual manner, from 213 parts of 1- co pound. and en a c e u solution o amino-nitrobenzene-Z-sulfonic acid, and the sodium carbonate is poured into the coupling pH value of the coupling mixture is adjusted to mixture in a manner analogous to that described 8.0 to 8.5 by the addition of sodium carbonate. in Example 1. The further procedure is exactly The coupling is complete in a few minutes. In

the manner described in the preceding examples the product is then coupled with 19 parts of 1:3-

HOsS

diaminobenzenei-sulfonic acid. The. dyestufi is precipitated from the hot solution in the form of the dyestufi acid by means of hydrochloric acid,

and separated by filtration. It dyes chrometanned leather black tints having an olive shade.

Example 5 100 parts of well fulled velour leather are in- R--N=N troduced into a dye vat with 8 times its weight of water at 60 C. 10 parts of the dyestuif obtainable as described in Example 2 are dissolved in 100 parts of water and added to the dye vat, and dye- (803K). HOzS ing is carried on for 1 hour. Fixing is then brought about by the addition of 5 parts of formic acid to the dye liquor and the treatment is continued for a further 30 minutes. The quantities Hols HO BOzH H035 are calculated on the dry weight of the leather.

Hogs HO O CHI H018 There is obtained a full greenish black dyeing.

SOzH no -B O aH H11 1 in which R represents an aromatic radical of the benzene series.

2. A trisazo dyestufi of the formula in which R represents a sulfonated aromatic radical of the benzene series.

3. A trisazo dyestufi of the formula IIIH: SOIH in which R represents an aromatic radical of the benzene series containing a single sulfonic acid group.

4. A trisazo dyestuif of the formula SOzH in which n represents a whole number but at the most 2.

5. The trisazo dyestufi of the formula 8 O :H HRN 6. The trisazo dyestuif of the formula 7. The trisazo dyestufi of the formula SOIE SOaH I IIUI:

8. The trisazo dyestufl of the formula I S OzH HiN 7 8 9. The trisazo dyestufi of the formula E E0 NH: 80111 H018 S0;H HaN RAYMOND GUNST.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 588,182 Rosenberg Aug. 17, 1897 688,478 Mueller Dec. 10, 1901 1,610,946 Hitch et a1 Dec. 14, 1926 2,183,087 Senn Dec. 12, 1939 

1. A TRISAZO DYESTUFF OF THE FORMULA 